[Diy_efi] acceleration enrichment? retard or advance ignition timing?

[Axel Rietschin]

My ECU has accel ignition advance only on the retard side. I cannot tell
more since I'm not using it but I can imagine it is used to avoid pinging
when opening the throttle very quickly, where the mixture can be lean for a
little while. Accel fuel will really depends on the engine, you'll need that
if there is a 'hole' (a lean miss) with you suddenly open the throttle. To
properly implement this feature you need to look at the throttle opening
rate (like deg/s), and have a decay rate (like %/rev) and possibly a clamp
value (like max ms), all rpm dependant and maybe also engine coolant temp
dependant :-)

hth,
Axel

----- Original Message -----
From: "Toffer Liu" <tof_l at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, August 10, 2002 2:36 PM
Subject: [Diy_efi] acceleration enrichment? retard or advance ignition
timing?


>
> Guys I'm confused...when you accelerate are you suppose to temporarily
> advance or retard the timing a bit more than the basic advance? One guy
> tells me I should retard timing because that's how the old vacuum advance
> works and another tells me I should advance it period. What's the reason
> behind the temporary advance or retard? How is this done? Is there a time
> duration for the temporary enrichment? Will it suffice to just read the
> throttle position sensor to know that the engine is accelerating and add a
> static enrichment? Any help would be much appreciated.
>
> Thanks In Advance,
> Toffer
>
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> Diy_efi mailing list
> Diy_efi at diy-efi.org
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